They are light and comfortable, with not much impact felt. I've used them for about 4 months, and the studs are still in good condition, and the insoles are relatively clean. There is some dirt on the heels. Price negotiations are welcome. [Quoted from the Asics website] fuzeGEL is installed in the heel of the sole to be effective during running, cushioning the impact at landing. The sole uses abrasion-resistant urethane that is difficult to wear down even on dirt. Made in Vietnam Material: Inner sole material: Synthetic resin/Replaceable Remarks: Compatible optional insoles: 1103A029/1103A055 Compatible optional insoles: 1103A029/1103A055 Compatible ground: Dirt, natural grass, artificial turf Size: 22-30 Width/Last: STANDARD Upper material: Synthetic resin, artificial leather (synthetic leather), natural leather Outer material: Synthetic sole (urethane)